JP3429721B2 - Metallic glossy aqueous stamp ink composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based stamp ink composition, and more particularly, to a metal glossy water-based stamp for a stencil that prevents generation of gas and corrosion, and has a strong glitter and a three-dimensional effect. It relates to an ink composition.

[0002]

2. Description of the Related Art A water-based stamp ink composition is used by being absorbed in an ink container (ink pad) such as felt or sponge. For example, stamp pads for stamping rubber stamps or plastic stamps or stamps are
The ink is absorbed by the ink storage body, the ink storage body is provided on the base, and the ink is spread on the seal surface of the seal or the stamp. In addition, the stencil pad has, for example, an ink storage body attached to a base body that constitutes a pen-shaped shaft body, and the open end surface of the ink storage body protruding from the base body is lightly tapped to make paper or cloth. It is pressed against the surface such as, and stamped, and the ink absorbed in the ink storage body is transferred to the surface of paper or cloth and imprinted through the cutout part such as letters, symbols, figures or patterns formed on the stencil plate. Has become. A sponge such as polyurethane is used as the ink storage body for the stencil.

[0003]

By the way, conventionally, a metal powder pigment such as an aluminum metal powder pigment is used as a colorant in order to obtain a stamp surface having a metallic luster color. However, the metal powder pigment is an aqueous ink composition. It is dangerous to use metal powder pigments, especially aluminum metal powder, as it reacts with hydrogen gas to generate gas such as hydrogen gas. Also, the metal powder pigments corrode during long-term storage and develop metallic luster. There was a problem that I could not. Therefore, conventionally, metal powder pigments have been used in a solvent system, and an aqueous stamp ink composition having a metallic luster color has not been substantially obtained. However, if safety and environmental protection are taken into consideration, an aqueous stamp ink composition that develops metallic luster is desired if possible. On the other hand, since it is a stamp ink composition, it can be absorbed by an ink storage body such as felt or sponge, and the ink is spread on the stamp face of a seal or a stamp, or stamped on the surface of paper or cloth. , An ink composition that can be used by transferring the ink from the ink container and imprinting it on the surface of paper or cloth. In this respect, when a pearl pigment is used as a metallic luster colorant, a water-based stamp ink composition having no gas generation and storage stability can be obtained, but it does not give a strong glittering feeling to the stamp surface. Moreover, it was not a metallic luster with a three-dimensional effect.

The object of the present invention is to produce an aqueous stamp ink composition which does not generate gas and corrode, and which can give a stamp having a metallic luster having a stronger glitter and a three-dimensional effect as compared with the conventional metal powder pigment. To provide things.
Another object of the present invention is to provide an aqueous stamp ink composition having excellent storage stability.

[0005]

As a result of intensive investigations by the present inventors, the use of a glass flake pigment as a metallic luster colorant makes it possible to obtain an aqueous stamp ink composition without using a metallic powder pigment. I found that I could do it. Moreover, when this glass flake pigment is used, due to the high surface smoothness of the glass, a stronger luster and three-dimensional effect can be obtained as compared with a water-based ink composition using a conventional luster pigment such as an aluminum powder pigment. We have found that we can obtain a unique stamp that has both. Furthermore, an aqueous stamp ink composition containing a glass flake pigment can be absorbed in an ink storage body such as felt or sponge, and the ink can be spread on the seal face of a seal or a stamp, such as paper or cloth. It has been found that even if the ink is transferred from the ink container and printed on the surface of paper or cloth, such as by stamping on the surface, a stamp surface having a metal luster equivalent to or more than that of the metal powder pigment can be obtained.

The present invention is a metallic gloss aqueous stamp ink composition containing a glass flake pigment as a metallic gloss colorant.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION (Glass Flake Pigment) The glass flake pigment of the present invention is used as a colorant which imparts a metallic luster to a stamp surface. The glass flake pigment of the present invention preferably has a coloring effect on the stamp surface, a metallic luster, and a hiding power.

The glass flake pigment used in the present invention has a structure in which flake-shaped glass is coated with a metal or the like, and is defined as a pigment having a glittering feeling and a three-dimensional effect.
As an example, a glass flake pigment in which flaky glass is coated with a metal by an electroless plating method can be used. For example, a product name “Metashine REFSX-2015P” manufactured by Toyo Aluminum Co., Ltd., which is coated with silver.
"S", "Metashine REFSX-2025PS", and "Metashine REFSX-2040PS" can be illustrated.

Further, a glass flake pigment in which flaky glass is coated with a metal by a sputtering method can also be used. For example, a product name “Crystal Color-GF2125” manufactured by Toyo Aluminum Co., Ltd. coated with silver,
"Crystal Color GF2125-M", "Crystal Color GF2140", "Crystal Color GF214
0-M ”. In addition, the product name “Crystal Color GF2” manufactured by the same company coated with nickel, chromium and molybdenum
525 ”,“ Crystal Color GF2525-M ”,
There are "Crystal Color GF2540" and "Crystal Color GF2540-M". Also, the product name "Crystal Color GF250" manufactured by the same company coated with brass, and the product name "Crystal Color GF" manufactured by the same company coated with silver alloy.
1345 ”and the product name“ Crystal Color GF1445 ”manufactured by the same company coated with titanium.

The glass flake pigments can be used alone or in combination of two or more kinds.

In the present invention, the glass flake pigment preferably has a median diameter of 5 to 100 μm. When the median diameter of the glass flake pigment is less than 5 μm, the flake particles are too small, resulting in poor glitter, and when the median diameter of the glass flake pigment exceeds 100 μm, the viscosity becomes too high and stamping becomes difficult. Further, the fixing property of the stamp is also lowered.

The glass flake pigment of the present invention is preferably contained in the ink composition in an amount of 0.1 to 40% by weight. When the amount of the glass flake pigment is less than 0.1% by weight based on the total amount of the ink composition, the stamp ink has insufficient coloring power and glossy color, and the luster and stereoscopic effect are insufficient. When the glass flake pigment exceeds 40% by weight in the total amount of the ink composition, the viscosity of the ink becomes too high, the fluidity is lowered, and stamping becomes difficult. The optimum blending amount of the glass flake pigment is 0.5 to 30% by weight.

(Colorant) In the present invention, the glass flake pigment can be used alone without using the colorant, but the colorant can be used in combination with the glass flake pigment. When glass flake pigment is used without using a colorant, silver color,
A stamp surface having a metallic luster of gold or copper or an iris color can be obtained. When a colorant is used in combination with a glass flake pigment, a stamp surface having various colored metallic luster can be obtained depending on the type of the colorant. .

As the colorant, various known ones can be used. For example, inorganic pigments (for example, titanium oxide, carbon black, iron oxide, etc.), organic pigments (for example, azo pigments, condensed polyazo pigments, phthalocyanine pigments, quinacridone pigments, anthraquinone pigments,
Dioxazine-based pigments, indigo-based pigments, thioindigo-based pigments, perinone-based pigments, perylene-based pigments, melamine-based pigments, etc.), resin colored bodies, dyes and the like can be used.
Preferred colorants include pigments and resin colored bodies, and more preferably pigments and resin emulsion colored bodies. The colorants may be used alone or in combination of two or more. It is also possible to use a glass flake pigment in combination with a conventional metal powder pigment such as an aluminum pigment or various bright pigments such as a pearl pigment.

As the pigment (inorganic pigment, organic pigment, etc.), those having a fine particle diameter and excellent stability over time are preferable. In the present invention, the pigment can be used as a pigment dispersion that is previously dispersed in water or the like. When used as such a pigment dispersion, the average particle diameter of the pigment in the dispersion is not particularly limited, but is, for example, 0.08 μm to 0.4 μm.
It is preferably about the same. The concentration of the pigment in the pigment dispersion is not particularly limited.

As the resin colored body, for example, a styrene resin, an acrylic resin, or an acrylonitrile resin may be used alone or in an aqueous dispersion obtained by emulsion polymerization using two or more kinds thereof, and a dye (for example, a basic dye or a fluorescent dye) may be added. Basic dye)
And / or a resin emulsion colored body dyed (colored) with an optical brightener.

The amount of the colorant used is not particularly limited and is, for example, 2.5% by weight or less, preferably 1.25% by weight or less, based on the total amount of the ink composition. When the amount of the colorant used exceeds 2.5% by weight with respect to the total amount of the ink composition, the color developability of metallic luster decreases, and it is difficult to obtain suitable metallic luster.

(Thickener) In order to obtain a beautiful luster with a glass flake pigment, it is necessary to increase its median diameter. However, if the median diameter is increased, it tends to settle in the ink as described above. On the street. Therefore, the present invention has found that the glass flake pigment can be prevented from settling in the ink by further containing a thickener, preferably a thixotropic thickener, together with the glass flake pigment. The thixotropic thickener is not particularly limited, and known thickeners used in water-based ink compositions for ballpoint pens and the like can be used.

However, as the aqueous stamp ink composition, it is preferable to use an osmotic thickening agent that quickly penetrates and is absorbed in paper, has pseudoplasticity (pseudoplasticity), and does not hinder the dispersion of the pigment. By using a thixotropic thickener having penetrability, the storage stability of the ink can be increased, and particularly the storage stability of the glass flake pigment and the inorganic pigment as a colorant can be increased.

The penetrating thixotropic thickener is a polyglycerin monofatty acid ester of polyglycerin represented by the following formula (1) and a fatty acid having 8 to 20 carbon atoms, sorbitan, and 8 to 8 carbon atoms. A sorbitan monofatty acid ester with 20 fatty acids is preferably used.

[0021]

[Chemical 1] (In the formula, n is an integer of 4 to 8.)

The fatty acid may be either saturated fatty acid or unsaturated fatty acid. More specifically, examples of the fatty acid include caprylic acid, capric acid, lauric acid, oleic acid, stearic acid and the like.

In the polyglycerin monofatty acid ester or sorbitan monofatty acid ester, the hydroxyl group which reacts with the fatty acid may be any hydroxyl group among the hydroxyl groups in the polyglycerin or sorbitan represented by the above formula (1). A hydroxyl group bonded to a terminal carbon atom is preferred. That is, as the polyglycerin monofatty acid ester or the sorbitan monofatty acid ester, an ester obtained by reacting a fatty acid with a hydroxyl group bonded to a terminal carbon atom of either polyglycerin or sorbitan represented by the above formula (1) Is preferred.

As the permeable thixotropic thickener, the above-mentioned polyglycerin monofatty acid ester is most suitable. The osmotic thickeners can be used alone or in combination of two or more.

The amount of the penetrating thixotropic thickener, such as polyglycerin monofatty acid ester or sorbitan monofatty acid ester, used is not particularly limited, and is 10% by weight to 60% by weight, preferably 20% by weight based on the total amount of the ink composition.
% To 40% by weight. When the amount of the thickener used is less than 10% by weight based on the total amount of the ink composition, the ink permeability is lowered, the thixotropic property is lowered, and the glass flake pigment is liable to settle, and the storage stability of the ink is reduced. Is reduced. On the other hand, if the amount of the thickener used is more than 60% by weight with respect to the total amount of the ink composition, the viscosity of the ink becomes high and stamping becomes difficult.

(Wetting Agent) As the wetting agent, one having a wetting effect without affecting the viscosity of the ink can be used. Examples of the wetting agent include glycerin, diglycerin, triglycerin, glycols (eg, ethylene glycol, diethylene glycol, propylene glycol, etc.) and the like. Preferred humectants include glycerin, diglycerin, ethylene glycol. The wetting agent may be used alone or in combination of two or more kinds.

The amount of the wetting agent used is not particularly limited and is, for example, 70% by weight or less, preferably 10% by weight to 50% by weight, based on the total amount of the ink composition. When the amount of the wetting agent used is more than 70% by weight based on the total amount of the ink composition, the drying time of the ink becomes long.

In the aqueous stamp ink composition of the present invention,
In addition to the above components, water and, if necessary, additives such as a fragrance, an antiseptic, a rust preventive, a fungicide, an antioxidant, and a light stabilizer can be used.

(Production Method) The method for preparing the aqueous stamp ink composition of the present invention is not particularly limited. For example, an aqueous stamp ink composition is prepared by mixing a penetrating thickener, a wetting agent and, if necessary, water or various additives with stirring by a dissolver or the like, and then adding a glass flake pigment and a coloring agent and stirring. Then, it is prepared by defoaming if necessary. When a pigment is used as the colorant, it may be used as a pigment dispersion as described above.

As described above, the water-based stamp ink composition of the present invention, even though it is a water-based stamp ink, does not generate gas, does not corrode, and has a strong luster and a three-dimensional effect. Can produce gloss. Moreover, by adding a thixotropic thickener, it is possible to prevent the glass flake pigment from settling, a stamp ink composition having excellent dispersibility over a long period of time is obtained, and the storage stability of the ink is excellent.

The stamp ink composition of the present invention is useful as an ink for stamp pads, stencil pads and the like. The aqueous stamp ink composition of the present invention can be used by being absorbed in an ink storage body made of, for example, felt or sponge (for example, sponge made of polyurethane).

[0032]

EXAMPLES The present invention will be described in more detail based on the following examples and comparative examples, but the present invention is not limited to these examples.

Example 1 An aqueous stamp ink composition having the composition shown in Table 1 (in Table 1, the ratio of each component is shown by weight% based on the total amount of the ink composition) was prepared. More specifically, at room temperature, polyglycerin mono-fatty acid ester as a thixotropic thickener, and glycerin as a wetting agent are put and mixed by stirring with a dissolver, which is a glass as a metallic luster colorant. A flake pigment and, if necessary, a pigment dispersion of a colored pigment were added, stirred and mixed, and then defoamed to prepare an aqueous stamp ink composition.

(Examples 2 to 4) In the same manner as in Example 1,
Aqueous stamp ink compositions having the compositions shown in Table 1 were prepared.

Comparative Examples 1 to 4 In Comparative Examples 1 to 4, aqueous stamp ink compositions having the compositions shown in Table 1 were prepared in the same manner as in Example 1. In Comparative Example 1, a metal powder pigment (aluminum powder pigment) was used as the metallic luster colorant. Comparative Example 2 has a composition in which the colorant exceeds 2.5% by weight. Comparative Example 3 is a composition using a pearl pigment. Comparative Example 4 is a composition when the amount of the thixotropic thickener is small.

[0036]

[Table 1]

In Examples 1 to 4 and Comparative Examples 1 to 4,
The following raw materials were used. (Glass flake pigment) -Brand name "Metashine REFSX-2040PS",
Toyo Aluminum Co., Ltd., median diameter approx. 40 μm (aluminum powder pigment) ・ Brand name “WJP-U75C” (Toyo Aluminum Co., aluminum powder pigment, average particle size: 15 μm) (pearl pigment) ・ Brand name “Iriodin 100 Silver Pear "(Merck,
Particle size 10-60 μm)

(Colorant) The following blue pigment (phthalocyanine blue) is used as a colorant.
To prepare a pigment dispersion.・ Phthalocyanine blue 25% by weight ・ Styrene acrylic resin 5% by weight ・ Propylene glycol 5% by weight ・ Sodium hydroxide 0.06% by weight ・ Ion-exchanged water The balance The above components are dispersed by a bead mill, and the average particle size is 0.06μ.
A pigment dispersion of m was obtained. In addition, the phthalocyanine blue used the trade name "First Gen Blue BSW" (manufactured by Dainippon Ink and Chemicals, Inc.) and the styrene acrylic resin used the trade name "John Krill 679" (manufactured by Johnson Polymer Co., Ltd.). (Polyglycerin monofatty acid ester) -Brand name "SY Glister ML-500" (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) (Glycerin) -Brand name "glycerin" (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.)

(Evaluation) The aqueous stamp ink compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were subjected to a metallic gloss test after stamping and an ink storage stability test.

(Metallic gloss test) The water-based stamp ink compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were absorbed in an ink container composed of a sponge. As described above, this ink storage body is attached in a protruding state to the base body that constitutes the pen-shaped shaft body, and constitutes a so-called stencil pad pen. Next, using this pad pen, a water-based stamp ink is stamped on the postcard paper by gently tapping the open end surface of the ink storage body that has jumped out of the substrate, and immediately after the stamp and at the stamp 60.
After each minute, the metallic luster and the three-dimensional effect of each stamp surface were visually evaluated according to the following evaluation criteria. In addition,
The evaluation results are shown in "Glitter feeling after stamping" and "Three-dimensional feeling after stamping" in Table 1. (Evaluation Criteria) ◯: The stamp surface shows a strong glittering or stereoscopic effect.
In the case of containing a coloring pigment, it shows a colored metallic luster. Δ: The metallic luster of the stamp surface is slightly lower than that of the above-mentioned “◯”, but it has a glittering feeling or a three-dimensional effect in a range where there is no practical problem. X: The stamp surface has no metallic luster.

(Storage stability test) The aqueous stamp ink compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were treated at 50 ° C.
The sample was stored for 1 week and visually evaluated according to the following evaluation criteria.
The evaluation results are shown in "Pigment sedimentation" and "Gas generation" in Table 1. (Evaluation Criteria) O: Pigment (glass flake pigment, aluminum powder pigment or pearl pigment) does not sediment. No gas is generated. X: Pigment (glass flake pigment, aluminum powder pigment or pearl pigment) settles. Gas is generated.

(Evaluation Results) From Table 1, in the water-based stamp ink compositions according to Examples 1 to 4, since the glass flake pigment was used as the metallic luster colorant instead of the aluminum powder pigment, A stamped surface having a metallic luster can be obtained without causing any gas generation and corrosion. In particular, in Examples 1 to 3, the ink of Comparative Example 1 having a stronger glossy feeling than the ink composition of Comparative Example 1 containing the aluminum powder pigment and further containing the aluminum powder pigment. A "three-dimensional effect" that was not present in the composition appeared on the stamp surface, showing a unique metallic luster. In Comparative Example 2, the glass flake pigment is used, but since the amount of the coloring pigment used is too large, the glossiness and the three-dimensional effect due to the glass flake pigment are deteriorated.
In Comparative Example 3 in which the pearl pigment was used, no gas was generated and the sedimentation of the pigment particles was suppressed and the storage stability was good, but the glitter after stamping was lower than that of the ink composition of the present invention. There is no "three-dimensional effect".

In Examples 1 to 4, the amount of polyglycerin monofatty acid ester used was at a suitable value, and the storage stability of the ink was excellent. On the other hand, Comparative Example 4 containing less than 10% by weight of polyglycerin monofatty acid ester
In the above ink composition, the glass flake pigment settled in the stamp ink, and the storage stability of the ink was lowered. These tendencies also apply to sorbitan fatty acid esters.

On the other hand, Comparative Example 1 using the conventional aluminum powder pigment shows metallic luster, but the aluminum powder pigment and water react with each other to generate gas (hydrogen gas).

[0045]

The aqueous stamp ink composition of the present invention comprises
As a glass flake pigment is used as the metallic luster colorant instead of the conventional metallic powder pigment, it prevents the generation and corrosion of gas and creates a unique metallic luster color stamp surface with a strong luster and three-dimensional effect. Can be revealed. Further, the storage stability of the glass flake-containing ink can also be improved by making the ink composition further contain a thixotropic thickener.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-302259 (JP, A) JP-A-8-20740 (JP, A) JP-A-10-279853 (JP, A) JP-A-5- 117569 (JP, A) JP 62-104881 (JP, A) JP 11-319147 (JP, A) 38th FRP CON-EX'93 (38th FRP General Lecture with Showroom) Nagoya City Institute of Industrial Research, Association for Reinforced Plastics, pages 39-42, session October 20th (Tuesday) -22nd (Friday) 1993 44th FRP CON-EX'99 in NAGOYA City Institute of Technology, Coloring Materials Association, September 16, 1998, A-2 / 1 to A-2 / 2 pages, session October 21 (Thu) to 22 (Fri) 1999 Color material research presentation Conference Lecture Summary Venue Nagaragawa International Congress Center, September 16, 1998, 119, 121, 123 pages, session September 16, 1998 (Wednesday), 17th (Thursday) Plastic Industrial Materials Newspaper No. 697, Limited Company Industrial Materials Newspaper, October 15, 1999, pages 1, 2, 9 (58) Fields investigated (Int.Cl. ⁷ , DB name) C09D 11/00

Claims (4)

(57) [Claims] 1. A stamp face is stored in a stamp ink storage body.
Glossy metallic water-based stamp ink composition for transfer to
And coated with flake-shaped glass metal as a metallic luster colorant.
A glass flake pigment, as the coloring agent used in combination with the glass flake pigment, colored
Any of the above-mentioned coloring pigments and resin colored bodies or two or more kinds
The above- mentioned glass flake pigment- containing metal containing a colorant combined with the above and a thixotropic thickener is silver or a silver compound.
Gold, brass, nickel-chromium-molybdenum alloy, titanium
0.1% to 40% by weight of the glass flake pigment, and 2.5 % by weight of the colorant used in combination with the glass flake pigment in the total amount of the stamp ink composition.
% Or less, 10 to 60% by weight of the thixotropic thickener is contained, and the metallic luster color aqueous stamp ink composition is contained. 2. The median diameter of the glass flake pigment is
The metallic glossy water-based stamp ink composition according to claim 1, which is in the range of 5 μm to 100 μm . 3. The glass flake pigment used in combination with the above.
Coloring pigments have an average particle size of 0.08 μm to 0.4 μm
The metallic stamp aqueous stamp ink composition according to claim 2, which is a pigment . 4. The thixotropic thickener is a porosity
Liglycerin monofatty acid ester or sorbitan monofat
The metallic luster color aqueous stamp ink composition according to claim 3, which contains a fatty acid ester .